Edit: Cisco 2960 does not Support Netflow as it has only Layer 2 Capabilities. You will need a Layer 3 Device to be able to use NetFlow.
Here is documentation on enabling NetFlow and CBQoS (in case anyone needs the information)
Configuring class-based quality of service (CBQoS) for Cisco devices
I hate to contradict a SW staff member, but the Catalyst 2960 does not support NetFlow. The only way to get NetFlow data out of lower-end switches is to mirror the traffic to an external flow generator. Only the Catalyst 3750-X and higher support NetFlow.